private static void VerifyItems(IEnumerable <OrderItem> items, LookupAggregate lookup)
{
foreach (var orderItem in items)
{
VerifyAggregateExists <Product>(orderItem.ProductId, lookup);
}
}
public IAggregate Handle(PlaceOrder command)
{
var lookup = new LookupAggregate(_domainRepository);
var order = Order.Create(command.Id, command.CustomerId, command.Items, lookup);
return(order);
}
private static void VerifyAggregateExists <TAggregate>(Guid aggregateId, LookupAggregate lookup) where TAggregate : IAggregate, new()
{
lookup.GetById <TAggregate>(aggregateId);
}
public static IAggregate Create(Guid id, Guid customerId, FSharpList <OrderItem> items, LookupAggregate lookup)
{
VerifyAggregateExists <Customer>(customerId, lookup);
VerifyItems(items, lookup);
return(new Order(id, customerId, items));
}